SOAP is three different things

by Volker Weber

There are three major usage modes or ways to think about SOAP.

1. as a very generic messaging framework, as described in part one of the specification.

2. as a remote procedure call mechanism as in Part 2, Section 5.

2 a) An encoding for parameter values
2 b) A method calling syntax

3. as an extension mechanism for HTTP, as discussed in 6

Unfortunately, communication between developers or between customers and vendors is hampered by the different levels of interoperability implied by these different usage modes.

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